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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50053


    Title: Deformation characteristics of fine grained magnesium alloy AZ31B thin sheet during rapid gas blow forming
    Authors: Sun,PH;Wu,HY;Hsu,WC;Tsai,HH;Huang,CC;Lee,S
    Contributors: 機械工程學系
    Keywords: MG ALLOY;ELEVATED-TEMPERATURES;MECHANICAL-PROPERTIES;STRETCH FORMABILITY;2-STAGE DEFORMATION;SUPERPLASTICITY;BEHAVIOR;TECHNOLOGY;CAVITATION;FLOW
    Date: 2010
    Issue Date: 2012-03-27 17:02:16 (UTC+8)
    Publisher: 國立中央大學
    Abstract: Decreasing the forming time in gas blow forming using fine grained Mg alloy AZ31B thin sheet with a thickness of 0.6 mm was studied in this work. Tensile tests and gas blow forming using stepwise pressurisation profiles were performed to explore the deformation behaviour of a fine grained AZ31B Mg alloy sheet. The alloy sheets were successfully deformed into hemispherical domes using two proposed stepwise pressurisation profiles during gas blow forming. As a result, significant reduction in forming time was achieved. Maximum effective deformation rates of 1.02 x 10(-2) and 1.98 x 10(-2) s(-1) were obtained at 300 and 370 degrees C respectively. It was feasible to form a hemispherical dome with a height of 20 mm in less than 80 s at 370 degrees C. The results confirmed that the thickness distribution along the centreline of the formed dome was sensitive to the pressurisation profiles. A higher thinning effect was observed at 370 degrees C due to the higher deformation rate imposed during forming. Grain growth was not a serious problem for forming even at 370 degrees C, and static grain growth should be the major factor resulting in grain growth during forming.
    Relation: MATERIALS SCIENCE AND TECHNOLOGY
    Appears in Collections:[機械工程學系] 期刊論文

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